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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce1905e8015a49b4d3fa2e610e6c9b751becfcda311308f07dea88f3c791958' 
  AND token = '0NNXgeKHrm7yVAbT8wszK73Vz/iwjoBKGUzKlRt+TRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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