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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3069f5c4c78d324e47e8764665f6cf17b91f041efaaa0ba6bd35abbb95df314c' 
  AND token = 'A+OsxN/0LSh2DY3wOaInwcJe9PjTz7OAgW4wA1Uf2ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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