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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12893323ac53f2a9844a1d3a5e0c972b88ded9574205b02ceb974dce6c1ffe16' 
  AND token = 'KDnBcfHSCyvbN9BN9JAW3IlNQH2DWeboBH3Ryx78FWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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