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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19cb1f6eb8e347614a3f767cd16789963079e046efffdc66e2c3b96e5d9c90d' 
  AND token = 'JEnRfcZlGH9unz+IfWX5+89lvoB+OpGHNGCWOR9sceQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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