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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58679c3852d6ffb25a6466b86519b7db3dfc02faf056f7a65230cd8d46ab751f' 
  AND token = 'ktbQnJrNTgZL9tx76e+OO+4XyM+0OtXjhm6bzxZvy4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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