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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b9766ace57c849a4b177fdbc27e85684d9a2619ed3ce5738c5380ed4976d9f' 
  AND token = 'fbNNiQ1lo7iYdQsEt3IFSyHJ8jJzpXfvY8W3N+RWFnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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