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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ca766605192d32a949cf3049894a2a695c43a874d865f9df10980dd30714d1' 
  AND token = '4Ih4hlpzSHYmDfrZ5yAtQwbdyaPWK4HIysZxvZwNZk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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