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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537ccbbd0e093d3dfa7fe2171acc79f9068a2a012de7cb3da896271354246d7c' 
  AND token = 'V2lOtZPuQiDBW6I0q53Ue8rTiupDsfOJMsPGSlEf+Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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