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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6c1146df7e4f5ecafb2030fa95eb736c7374442105c98f06947859cbda91c6' 
  AND token = 'I0UkpYb4ECC6IpSe3YllUnEnwNGyjnONfgJEiS4cK+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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