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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f340f7afda0fc47a46df6fd8052154155246a7b3e06562dc536ea51b1eaa06e9' 
  AND token = 'xCvq1D9Tzo4zC4s1ZFToaxtUmSfO2sUvMkJAJmO/qts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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