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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be95bdf404f72006791991c0fea7d1f91998f67a2d869403ae2be712b3b07d72' 
  AND token = 'Wy6wiHdhbOY+u9+QgXPxPbleFB+Lee58mPeUf6WpjxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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