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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe9c6c1b5db835843066158c79fc5293be228fd18d8c65bdfd92546b8b4c382' 
  AND token = '0D78tGDBHeDFdjNDFqZurDdLE1N8JIbxso2BpzXj21M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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