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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ad72c05d89da46e4ef9fc4592259b2a3ef6b3f65ac8a896ea28defaf23e4c7' 
  AND token = 'OCZZSlZu9ynT59Ixyjpe3ncZBskq3KUcNBttNMae96w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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