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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beae73cb62973127cae39f1efcfcb9833425419a0f828d970d2c933430c98de5' 
  AND token = 'KitsiEFH50FRJhlholzrikI4o8sKQ5P0i6Mb/nnAr20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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