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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aef871cbfde92898f1a3dd74664ad6e462d48992ae546a3953a42e34a707f03' 
  AND token = 'oIm4di9zRsS1somlbvN6pHbCL3+Lge6aPmv7ZWkZzVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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