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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c651d7eb9a727e123128a9b7f7d0742038708a875daabcd1636ee21349efe7' 
  AND token = 'GZrmmlYdnCNNItqoEr2mJeSkk9mCszgOaCY9h2kmbOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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