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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7201850a1217e9896e0e77ffc452bb173888b4d798af7f0a5e9477a1221cfb9e' 
  AND token = '7rMvuN8vLO4yJKuwmEFh/4g6GpNKxm0ed0rApfy5XrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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