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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa531253cf5fc87bf2e499515dd9a4829a8619b7f064c4cf56d39bd4c7c90d04' 
  AND token = 'BRusyVF6Nvj12FMXd4qOVY6tVYPC0iF2nefxfTb8m14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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