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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665ce42abac4c943bcdd294d0a1d58bb4c7ce1cb14a01af2e3f313c501aae039' 
  AND token = 'qNSLe9Htiu8FHwZ7DB093qQ3QThdML5GoICggigjvRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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