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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f18d3fc4f797c2454caa3c74436d4c7fa77933e9e262cda69155a16e3f3525' 
  AND token = 'ibCdoPgtTPikxx058SZDbmyL//Cb8Au97aFJnQql0Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}