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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1db8ed2e83b3744851b27e76941a186d44c14a9b93d82438bec0ee9b14067e1' 
  AND token = '/XmYM2Se6PtdOmH6iLau+Pq8nf9RF6da+Uhqj5uofvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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