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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3873a1aa897fb6a76f6e34d7b3c9b906efb249352cb7d67a8f02ffb890dd6f6' 
  AND token = 'rW886dKIhbDwhmRktUJLjzOiN+bqEeZZlJbR9xNDBKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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