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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8773576bf300134426ea5c593ffc95892c6a4671b0f60a3a55700f8d0304af26' 
  AND token = 'pOn+djXuiGWaU1nAXoX5B1+Dr7jnYJ2Hov4pr1+qJKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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