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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5b9acc172f4f1e602cd18d6075ad13db17834ab7468c9e938b1554cd6912e5' 
  AND token = 'gWWTQvkkwcWrlcCqi6+dvH5xirG9qTqdmrIgmAnDsr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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