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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a15f4af9e2ece0caa3e12ddff80c9ab4e72681d21dd7a5ba1f53ff82cf1f3a' 
  AND token = 'pn1uuiGEa2IqYZSFH9K0YDwE0IEMaqDHreAkjcdUcvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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