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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345e4ec93dae5bfe0c156eba476527fc0f47865d294ae17cf1ab8c728f837124' 
  AND token = 'eU7hH8JJ60VYiM5AqyV2Of10100sylqBR4PJ0IYauuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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