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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5826d5ba8ba26de3e9fda631337778edfad985a481eecf52220cbb2f1c86364a' 
  AND token = 'dmat8eJLHhdI7UHEvqMepbvcW8HEYqx2Z8mgmC7HFtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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