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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90cc0a7727eab96b3175402cbfb7ebae82bf0a45a10da855615a7ae0aa493d9' 
  AND token = 'Tdh7B6zgD1MzkwLyRMqNbJnl3B7hnsZoXHPZ7C4oh8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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