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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f6744a7be6c66970885384623d8dfa98ed6bfd54e741e124ca164085cfa539' 
  AND token = 'CDUa6pcnqGIGO5TvkMTiID0FkZdC/grPp3kNLhy8iN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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