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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4230ef435e0b2f3099c250998aee980a03a9b7b6dbef30165ef04a2e8f2495e8' 
  AND token = 'Sq4gLWsRmvWdtdjnPOb2GwsHssHwb7P7Buq2yzVLIss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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