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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9ef0b1844a1c2edf933334513082bb22c81431fb850325e2aa22c5a6bf1340' 
  AND token = 'L4WCJhXMQSGaJv8gRTqfVwiwl68oo4GfafbAI8upDhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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