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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ede63fb89af6cefd41a6090eaf887a0d2f0d68695c6ce8e74859a67f0a5a31' 
  AND token = 'LYT/j8mxf1cUbOiENBMsbYDgPeW6vz8fJqlBC1lNWFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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