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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697cb1796010fa0440c363b7f0dc1cdcfe4ab5778ee95fb240f5b4332365fbb5' 
  AND token = 'BQLO53eEiQ632hZ/0bcof3Y5uF+tEe0HF8kHuLb0pBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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