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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee10b9c2c3350e98b32900495504ad20869003d32f1c20281fab681c8217b7f8' 
  AND token = '5MhVY8H4BtOGhUt2BRxbuIV+kryv8cxXuNOk6LARQAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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