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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cac3387457c9b298c6cd0493230d826974d1a7a90437bebd41f7b71d85dc40' 
  AND token = 'YWvyDhA45KXtycrXUywmHljg9ZPHf7TtIaF4p4LJaAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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