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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092e7efb4ce5786f13d2c58d9a78db65f1372410b35f3756ee5fbcf7b555a644' 
  AND token = '6SIvm5iemkMJsRl9Ww2Jj+Abbj7t+B71dpsgqRou71Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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