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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c6cf17ef7dcee23ebb7f5aa36de070f199efe77f9559940fbdcd466b733caa' 
  AND token = '77ayHjoaytWNgKdHnMj6gYsbgSWmtWrbyOKEv+O9O3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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