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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd4491a154d2ccdc6743d717f4585df8b73dc7469cdbf26cf5ab453f945b127' 
  AND token = 'QPVYPac02Deep0l0ZS4K9A25B35+foMjMUSihJrnIZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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