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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd5e212b7e7af18813c08d0c3785c75cdf330e6913e3320752f05a2e04948d7' 
  AND token = 'a+v9c/O59kTc5shCFuJhM5jMsJ0PReY0cjz4ueCAKjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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