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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6b719d5e1db67346b6b72fbacb5af2b9f06396a7d0ecc3cf6a06a0f887e88b' 
  AND token = 'CkCGGGP6KniZgPnE4IMl5JyDzeBH1pQh4xYHfkvd6Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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