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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab0591130a91909445f24d7f2a97523e9aa5b3adfa70f4c223c9138ccb4df0e' 
  AND token = '9ztW2RxOD5n+gRjkmVi/7Si8uxcKG7SjppAAiIt7nFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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