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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50c4cf8d3bc74faae7b4e678545c0d005f08f1cecd1dfb81a9b72af30031535' 
  AND token = 'ba4EGQA2M8jrY3EtS3hFHQbYdThB648G1hTO2XWmme8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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