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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6d5b2aa73bea4096529c80d34fda0e2773642cad61cc16862a8996861625da' 
  AND token = 'dbXhjz1SauiN1XkLF0MwR50MaEnMnKdP8C804H9wCXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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