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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6393035e2581c48fb7def14df88235e4f95c25e1d51f3924ab2beb64be9df1e7' 
  AND token = '9rN2P9uHlpvvGi9hLenmPrsyYIi3kHvn3ADpHvoeUUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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