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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c98fc91d2c68a7189f7de538e5cdf6d3530e7b1a2038dc0c9c8dc6c0a34387c' 
  AND token = 'fiPqDpysRiIH4x6FIZ+lqDFc7/EUwjo0cNnng6hohTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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