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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e55ea7ee2907bd94884117fabc5b84625bf8f55618e929e09f557fa23a29c07' 
  AND token = 'rj3gonVDb1T3YvWX3STfxNgUmGiZSSvL71TeuPz6FGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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