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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7e343c7ab1860620d0311b1b4c99e76623e4cc6ca78406582e3b989754750e' 
  AND token = '/l12C26JXw8B/YJB7Feb8EtwBF2JpZNoHuXwH3i+1AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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