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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530690a13c516a8a1270c9a3d8c1504f44270f6b86bfd8688f177741df535f72' 
  AND token = 'Pe55DXl8GY9KqLe00qcXgwEVSlC5lxpGSBxdUbvOG8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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