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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f615d278ec51808765e3a364ef8feb66750b8e39eb0a189dd285b9da9fef28f' 
  AND token = 't4rU9LXvWm+sHTh1jtj3Tmser6XJVe9BvBBf/ion0ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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