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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b96cc1137981d65c5b2eea459893e3628afc52f76eb35b1b538c79f6149bac' 
  AND token = '0uoap5vlBDnyRepq6VEgPBboZCt0DjGOTkK94XDp+Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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