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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1f9db9103bfa2cc44fbbcdc4c6f5faadef8528fa31a2578d4aeb0b3b4633ef' 
  AND token = 'buyTxRiiIEqFT2ac7SwRGa9T7j1Kf0NOPmbkAvNfmIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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