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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61db1053f7c14e9ce6a1e296bce50aa94564629814cb022c3dfaad5c1026cdc6' 
  AND token = 'Wt7tGYURgnPXb6Qy90WvWgZnhKsskZhvRYqeTCBDd8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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