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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a3d9b83a5938d1ab229b3336a848abd48c80595841920287467a4805bac7fc' 
  AND token = '0EyFH2n6lYEYqAhzTP94qlBCI+deU8YVwX4Sl4GX2+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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