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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e9f1b7ce660f89eddb0aeebaf9565e99b5ad574d4e8e39ec0ff6fddb5a53e9' 
  AND token = 'Bu6RkX840Fjpzljm+R4jMi09NVA3VLA6PrXGNGHy288=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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