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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6238c15b063168501c0667337c7da1769a88d39d265afe7f9c51ac0b3674bc2c' 
  AND token = '08uRv3qCEbc5JuFNKvAVqqWFK8ssQzYHxFvRArZt+4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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