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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce33e879d9dc932b6e60818d3a057838f50cb3d0337e9fc6fe5dbb7066df9cc' 
  AND token = 'B9T7bzyuqOEAqawYM0IsV09yLLxfzqS97VPrrgz/58k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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