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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef8d26c4babc932566ca1b8e4053d803c565b52bdd28ce5724d61d452e9adc9' 
  AND token = 'BaLSIf+99ObMJhZq/oRsISVvIEZgF0ZtlndcZtA2O/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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