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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e689d0c88e61dda84418dde23365401a3440215cf6038691020a4dc5199fa7a2' 
  AND token = 'WGHaXIbv6A3vldwLYs++G4cE8wGNf0FhR4ACOJvM8uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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