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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b0757cfc95e61c25f21831d1d2b41829362def9997c4b63f401b31e1245a0d' 
  AND token = 'vjD1lNowhFTzIBD1ohuLfvbNab++wQFp+CVdOWp48dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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