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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fe7f54d3e2f0996273fcb8077580f3e47a41e04c9b6c8a32614517cc5f54e8' 
  AND token = '2YfBd9rmvyW7Vxn4b/ZCVRl+Epp5qYaYY/b8A6xyTfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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